q_maxUpwards and q_maxDownwards cause issues for units with multiple endogenous inputs (and probably outputs).

If a unit is defined with multiple different inputs, an online variable and a minimum load, the q_maxUpwards and q_maxDownwards constraints are generated for both of the input gnu as well, enforcing a minimum consumption for the inputs separately.

While this is sometimes desired, the current implementation prevents creating units with minimum loads that can choose between two different input nodes (or a mix from both). Similarly, units with multiple outputs and a minimum load cannot currently be made to freely choose their output ratio.